Coelomechs are bio-mechanical vehicles encased in thick scales and sections of armor plating. Up to eight troops can transported within the belly, exiting from a cloacal opening on the ventral side of the craft. Their primary weapon system is a Disruptor Cannon array designed to fire in any direction, while a battery of swarm torpedoes are fired from the mouth. The torpedoes are drawn back into the mouth when close to enemies so the Coelomech take a bite from enemies it rams into.

These are the most devastating biomechs of the Dark Mariners, clad in thick armor plating and armed with heavy weapons, both natural and technological. They are fully amphibious, with a magnetic propulsion system, making them deadly above and below the sea surface.